Hi, I'm having trouble adding guest codes. They add perfectly in the Nest app but don't seem to take to the Yale lock. At first, neither lock was working. I removed the code and tried again which resulted in one lock working, and finally created a new user with a new code which did the trick. Just wondering if anyone has any tips to make sure in the future it works. As I use this for giving friends access it gives me pause to think the codes won't take.